most changes apart from a few minor text edits were based on the really good reviews and feedback for version 16, for example suggesting to be more careful about requiring percent-encoded characters in the <sms-body>, and to be more explicit about the fact that RFC 3966's Erratum 203 is critical for the SMS URI scheme.

any comments about this draft are highly welcome! and by the way, here is the web-based I-D tracker for this draft, which means you can simply bookmark that page or even subscribe to its feed, and then you will see every official activity regarding the draft.